Playing their first game in 16 days. They needed roughly 20 minutes to shake off the rust before scoring the first 14 points of the second half to break it open and cruise to their seventh straight win.

Williamson — who was recruited hard by Clemson with his hometown of Spartanburg, South Carolina, is an hour’s drive from the Tigers’ campus. He put on a show after halftime with a pair of slick drives down the lane for layup immediately before Barrett’s jumper gave Duke its first 20-point lead with just under 17 minutes left.

ACC openers have been tricky for recent freshman-dominated Blue Devils teams. They hadn’t won one since the 2015-16 season. And this one was borderline tenuous for a half. Then the Zion Show got rolling, and it turned into yet another easy win.

They’ll be talking about Williamson’s 360 for quite some time. Barrett — who leaped with excitement in the backcourt as Williamson went airborne a few feet past the free-throw line — jokingly rated the dunk as a seven out of 10. Teammate Mike Buckmire, who sat next to Williamson in the locker room, received a high-five from him after he called it an eight.

“He’s right — not a 10,” Williamson said.

Asked what a 10 would look like, he quipped: “Got to see. Can’t tell you yet.”

This one couldn’t have gone much worse for the fourth member of Duke’s freshman class: Cameron Reddish finished with six turnovers and four points on 1-of-8 shooting and missed all four 3s he attempted. Five of those miscues came in the first half when they seemed to snowball on him. “I think he’s just got to be stronger with the ball,” Krzyzewski said. “That’s an adjustment for all freshmen in the league. Tonight, we’re playing against men. He’ll be fine, and we have confidence in him, but he didn’t play well tonight.”